56643609 has 48 divisors (see below), whose sum is σ = 89861184. Its totient is φ = 31595520.

The previous prime is 56643589. The next prime is 56643659. The reversal of 56643609 is 90634665.

It is a happy number.

It is not a de Polignac number, because 56643609 - 2⁵ = 56643577 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56643659) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413389 + ... + 413525.

It is an arithmetic number, because the mean of its divisors is an integer number (1872108).

Almost surely, 2^56643609 is an apocalyptic number.

It is an amenable number.

56643609 is a deficient number, since it is larger than the sum of its proper divisors (33217575).

56643609 is a wasteful number, since it uses less digits than its factorization.

56643609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 56643609 is about 7526.1948553037. The cubic root of 56643609 is about 384.0463472162.

The spelling of 56643609 in words is "fifty-six million, six hundred forty-three thousand, six hundred nine".